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Let's see, the wavelength (in meters) would be h*c/E*q; where h is planck's constant (6.626E-34 J*sec), c = velocity of light in vacuum (2.9979E8 m/sec), E is the energy in ev, and q is the electron charge (1.602E-19 C)...so if E = 500 kev, you end up with:
Edit: Just so you don't get confused by the units, 1 joule of energy is the amount of energy needed to accelerate 1 coulomb of charge through a potential difference of 1 volt...thus coulombs = joules/volt...so to make the dimensions work out, think of "q" as joules per volt of energy rather than electron charge.
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